Just to clarify. They have a completely separate list of classifications for jumps races (known as national Hunt racing). The biggest events are at Grade 1, such as the Gold Cup, Champion Hurdle, Champion Chase and World hurdle (all at the Cheltenham festival). The Grand National is a Grade 3, as handicaps can't be classified any higher. While they do breed horses specifically for jumping, I am not sure how many actual jumping sires there are, as most of the jumpers, like here, are geldings.